The reports are often eerily similar, leading to speculation the bizarre UFOs could be REAL.

Many reports tell of a silent triangle shape, defined by a series of lights, that are said to be in some cases as big as a football field, moving slowly across the sky.

The new sighting took place on April 25.

In a report to MUFON, the witness, who was driving back from Tybee Island with a roommate, said: “I was sitting in the passenger seat, looking out of the window.

“We were headed south on East Broad when I saw two very large, triangular crafts hovering above the city.

“They were very dark (dark grey to black) in colour.

“They were covered in large, round white lights.

“The crafts were parallel to each other and perpendicular to the ground.

“The widest part of the triangle was closest to the ground with the top pointing upward.

“They stayed stationary. I saw them above the city, fairly low, flying for any sort of air traffic.”

The most infamous mass triangle UFO sighting was the Phoenix Lights incident of March 13 1997 over Arizona.

Five lights in a formation were seen by thousands of people over three hours from 7.30pm to 10.30pm.

The sightings took place a cross a 300-mile area from Phoenix to Tucson.

It was blamed by officials as military flares at the time.

Another mysterious case was the Belgian UFO wave from November 1989.

Thirty different groups of witnesses and three groups of police officers reported seeing on November 29 a large object flying at low altitude.

The craft was described as “flat, of triangular shape, with lights underneath”, and being silent as it slowly moved across Belgium towards the Netherlands and Germany.

Some alien hunters believe they are the motherships of extraterrestrials visiting Earth.

However, many conspiracy theorists believe they are actually secret aircrafts developed by the US Air Force (USAF) which are being tested.

The TR-3B is alleged by conspiracy theorists to be a secret “black project” spy craft of the US Government that can be flown into space.

The allegations are that these crafts are created at top-secret military bases like Area 51 in Nevada, by reverse engineering alien technology.

Earlier this month Express.co.uk revealed how Steve Bassett, a prominent UFO disclosure lobbyist in the US, believes that many triangle UFOs could have been secretly built by the US using technology recovered from crashed flying saucers.